Stable water isotopes and major ions in snow along a traverse route between Kohnen Station and former Plateau Station, snow profiles ANT-Land_2016_COFI_24

At the majority of the sampling locations, 4 snow profiles in a triangle setup (one profile in the center surrounded by the others with 10m spacing) have been sampled. The common sampling setup is attached as a figure (see "Further details"). At some locations, there are less samples available or the central profile was deepened to 4m.Measurement quality statement:CRDS: Precision for δ18O of <0.1‰IC: Normative precision of <10% for anions, <20% for cations.We report quality (accuracy) issues for Ca2+, Mg2+ and K+ concentrations in the IC system.Ca2+, Mg2+ and K+ concentrations are significantly lower than those measured by other methods, especially for low concentrations (<30ppb).The exact cause of this under-recovery is still under investigation.

在绝大多数采样点位，均采用三角布设方案采集4条雪剖面：中心布设1条剖面，其余3条以10米间距环绕中心剖面。标准采样布设方案以附图形式呈现（详见"进一步细节"）。部分采样点位的有效采样数量不足，或中心剖面的采样深度加深至4米。

测量质量说明：
- 腔环谐振荡光谱仪（CRDS）：δ¹⁸O的测量精度优于0.1‰；
- 离子色谱仪（IC）：常规检测精度为阴离子测量精度优于10%，阳离子测量精度优于20%。

本数据集提及离子色谱系统在Ca²⁺、Mg²⁺及K⁺浓度测量中存在质量（准确度）问题。Ca²⁺、Mg²⁺及K⁺的测量浓度显著低于其他方法的检测结果，尤其在浓度低于30ppb的低浓度样本中偏差更为显著。此种回收率偏低现象的确切成因目前仍在研究中。